Simulation of an aperture-based antihydrogen gravity experiment

Ordonez, C. A.; Hedlof, R. M.

doi:10.1063/1.3698146

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…It should be noted that similar simulations for a single aperture also show that the probability of annihilations within each of the shadow regions is decreased by approximately 40% if a finite sized antihydrogen plasma is considered as opposed to the point source value for parameters similar to those reported by existing antihydrogen collaborations [9]. The results using the analytical model are shown in Table 2.…”

Section: ± T (K)supporting

confidence: 56%

Simulation of an antihydrogen gravity experiment utilizing multiple apertures

Hedlof

Ordonez

2013

AIP Conference Proceedings

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An analytical model and a Monte Carlo simulation of an antihydrogen gravity experiment that would employ multiple apertures are presented. Such an experiment may be possible at the CERN Antiproton Decelerator facility. The model was developed with the primary goal of reducing the experimental run time necessary to determine the direction of free fall acceleration for antimatter in the gravitational field of the Earth. The experiment would confine cryogenic antihydrogen plasma for producing antihydrogen (e.g., by three-body recombination). A cylindrical drift tube would have a horizontal axis of symmetry, with a series of coaxial apertures positioned on one or both sides of the region for antihydrogen production. The experiment would employ a detector capable of distinguishing between cosmic rays and antihydrogen annihilations. The distribution of annihilations on the drift tube would be azimuthally asymmetric for a short distance beyond each aperture within a shadow region depending on the direction of the gravitational acceleration of antimatter. The analytical model is used to determine the probability that an antiatom would annihilate within one of the shadow regions for specified experimental parameters.

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Section: ± T (K)supporting

confidence: 56%

Simulation of an antihydrogen gravity experiment utilizing multiple apertures

Hedlof

Ordonez

2013

AIP Conference Proceedings

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“…This corresponds to a reduction in experimental run time by a factor of 3,000 from the 58 days that was previously reported in Ref. 18 for an aperture-based experiment that employs a cylindrical drift tube.…”

Section: Monte Carlo Simulationmentioning

confidence: 90%

“…[12][13][14][15][16][17] Aperture-based antihydrogen gravity experiments have been previously considered that use a horizontal, cylindrical drift tube with a single or multiple aperture setup. 18,19 The present work represents a third iteration of study on a possible aperture-based antimatter gravity experiment. The analysis indicates that a substantial reduction in experimental run time may be possible relative to that predicted by the previous studies.…”

Section: Introductionmentioning

confidence: 99%

Aperture-based antihydrogen gravity experiment: Parallel plate geometry

2013

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An analytical model and a Monte Carlo simulation are presented of an experiment that could be used to determine the direction of the acceleration of antihydrogen due to gravity. The experiment would rely on methods developed by existing antihydrogen research collaborations. The configuration consists of two circular, parallel plates that have an axis of symmetry directed away from the center of the earth. The plates are separated by a small vertical distance, and include one or more pairs of circular barriers that protrude from the upper and lower plates, thereby forming an aperture between the plates. Antihydrogen annihilations that occur just beyond each barrier, within a “shadow” region, are asymmetric on the upper plate relative to the lower plate. The probability for such annihilations is determined for a point, line and spheroidal source of antihydrogen. The production of 100,000 antiatoms is predicted to be necessary for the aperture-based experiment to indicate the direction of free fall acceleration of antimatter, provided that antihydrogen is produced within a sufficiently small antiproton plasma at a temperature of 4 K

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“…29,30 Antihydrogen is currently produced and trapped by using nested Penning traps to confine antihydrogen plasma. 31,32 However, plasma drifts within nested Penning traps represent a formidable problem for producing antihydrogen with sufficiently low kinetic energy to be trapped in useful quantities for experimentation.…”

Section: Introductionmentioning

confidence: 99%

Space-charge-based electrostatic plasma confinement involving relaxed plasma species

2012

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A numerical study is reported on the equilibrium properties of a surface-emitted or edge-confined non-drifting plasma. A self-consistent finite-differences evaluation of the electrostatic potential is carried out for a non-neutral plasma that follows a Boltzmann density distribution. The non-neutral plasma generates an electrostatic potential that has an extremum at the geometric center. Poisson's equation is solved for different ratios of the non-neutral plasma size to the edge Debye length. The profiles of the electrostatic potential and the plasma density are presented for different values of that ratio. A second plasma species is then introduced for two-plasma-species confinement studies, with one species confined by the space charge of the other, while each species follows a Boltzmann density distribution. An equilibrium in which a neutral region forms is found. An equilibrium is also found in which the two species have equal temperatures and charge states. V C 2012 American Institute of Physics. [http://dx.

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Simulation of an aperture-based antihydrogen gravity experiment

Cited by 8 publications

References 26 publications

Simulation of an antihydrogen gravity experiment utilizing multiple apertures

Simulation of an antihydrogen gravity experiment utilizing multiple apertures

Aperture-based antihydrogen gravity experiment: Parallel plate geometry

Space-charge-based electrostatic plasma confinement involving relaxed plasma species

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